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Copy pathtest-eventtarget-whatwg-passive.js
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65 lines (56 loc) · 1.9 KB
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'use strict';
const common = require('../common');
// Manually converted from https://github.com/web-platform-tests/wpt/blob/master/dom/events/AddEventListenerOptions-passive.html
// in order to define the `document` ourselves
const {
fail,
ok,
strictEqual
} = require('assert');
{
const document = new EventTarget();
let supportsPassive = false;
const query_options = {
get passive() {
supportsPassive = true;
return false;
},
get dummy() {
fail('dummy value getter invoked');
return false;
}
};
document.addEventListener('test_event', null, query_options);
ok(supportsPassive);
supportsPassive = false;
document.removeEventListener('test_event', null, query_options);
strictEqual(supportsPassive, false);
}
{
function testPassiveValue(optionsValue, expectedDefaultPrevented) {
const document = new EventTarget();
let defaultPrevented;
function handler(e) {
if (e.defaultPrevented) {
fail('Event prematurely marked defaultPrevented');
}
e.preventDefault();
defaultPrevented = e.defaultPrevented;
}
document.addEventListener('test', handler, optionsValue);
// TODO the WHATWG test is more extensive here and tests dispatching on
// document.body, if we ever support getParent we should amend this
const ev = new Event('test', { bubbles: true, cancelable: true });
const uncanceled = document.dispatchEvent(ev);
strictEqual(defaultPrevented, expectedDefaultPrevented);
strictEqual(uncanceled, !expectedDefaultPrevented);
document.removeEventListener('test', handler, optionsValue);
}
testPassiveValue(undefined, true);
testPassiveValue({}, true);
testPassiveValue({ passive: false }, true);
common.skip('TODO: passive listeners is still broken');
testPassiveValue({ passive: 1 }, false);
testPassiveValue({ passive: true }, false);
testPassiveValue({ passive: 0 }, true);
}